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XML Namespaces - PowerPoint PPT Presentation


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XML Namespaces. Each schema file associated with a URL to uniquely identify where elements come from Like packages in Java. http://www.ebay.com. http://www.amazon.com. http://www.superstore.ca. TargetNamesapce. So, if I’m writing a schema for my superstore <schema ...

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xml namespaces
XML Namespaces
  • Each schema file associated with a URL to uniquely identify where elements come from
    • Like packages in Java

http://www.ebay.com

http://www.amazon.com

http://www.superstore.ca

targetnamesapce
TargetNamesapce
  • So, if I’m writing a schema for my superstore

<schema ...

targetNamespace=“http://www.superstore.com”

>

label prefixes
Label prefixes
  • Instead of referring to URLs, namespaces are given short prefix labels

<schema ...

targetNamespace=“http://www.superstore.ca”

xmlns:ebay=http://www.ebay.com

>

<element name=“eBayProduct” ref=“ebay:Product” />

</schema>

referring to xml schema schema
Referring to XML Schema schema
  • XML Schema is an XML language itself with a schema.

<xs:schema

targetNamespace=“http://www.superstore.ca”

xmlns:ebay=http://www.ebay.com”

xmlns:xs=“http://www.w3.org/2001/XMLSchema”

>

<xs:element name=“eBayProduct” type=“ebay:Product”/>

</xs:schema>

default namespace
Default Namespace
  • One namespace can be given no label, for convenience

<schema ...

targetNamespace=“http://www.superstore.ca”

xmlns:ebay=http://www.ebay.com”

xmlns=“http://www.w3.org/2001/XMLSchema”

>

<element name=“eBayProduct” type=“ebay:Product”/>

</schema>

declarations
Declarations
  • Prefixes are not used when declaring names of elements or types
  • Prefixes are used when referring to elements or types

<schema ...

targetNamespace=“http://www.superstore.ca”

xmlns:ebay=http://www.ebay.com”

xmlns=“http://www.w3.org/2001/XMLSchema”

>

<element name=“eBayProduct” type=“ebay:Product”/>

</schema>